Tazz cuts out randomly when reaching normal running temperature

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Starman20

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Tazz 2006 2E engine 134,000kms - I have a 2006 Toyota Tazz 1300 with a 2e engine with a mechanical fuel pump and carburetor and have a problem with the car periodically stalling when reaching normal running temperature and while idling eg at a robot when the car first splutters, will not rev and then stalls. I suspected the petrol pump and I replaced this. The car runs perfectly but still now every so often again stalls as described above. .After a minute or so I am able to restart the car and drive normally. However lately this splutter kicks of one of the vacuum pipes which makes the stalling more frequent. ( should I put a clamp on this pipe to keep it in place of will the spluttering then kick off another on of the many vacuum pipes?)However this creates a feeling of unreliability and I am afraid to travel any longer distances. What could possibly be the problem where the car runs perfectly for a while but stalls periodically? I have checked the petrol vacuum aspect by opening the petrol filler cap and hear not vacuum suck which does not seem to be the problem and when the car stalls there is petrol in the petrol filter.
Any help would be great.
 
Last edited:
No idea. AI.

This sort of intermittent stalling on a Toyota Tazz 2E carbureted engine is a fairly common puzzle, and the symptoms you’ve copied point to a fault that only shows up once the engine is warm. Let’s break down the likely culprits, given the facts:



Key Symptoms from the description​


  • Runs perfectly when cold.
  • Stalls after reaching normal running temperature, especially at idle.
  • Before stalling: splutters, won’t rev, then dies.
  • Restarts fine after a minute.
  • Splutter sometimes causes a vacuum hose to pop off.
  • Fuel filter still has fuel after stall (so pump supply isn’t obviously failing).
  • Recently replaced mechanical fuel pump.


Likely Causes​


1️⃣ Carburetor Overheating / Fuel Percolation (Vapour Lock)​


  • On these old 2E engines, heat soak after warming up can cause fuel in the carb float bowl to boil, creating vapour bubbles that mess with mixture.
  • This explains:
    • Why it’s fine cold, but stalls when hot.
    • Why you can restart after cooling for a minute.
  • Common causes:
    • Missing or damaged heat shield between intake manifold and exhaust.
    • Blocked carb venting or faulty anti-percolation valve.
    • Old fuel lines running too close to the exhaust.


2️⃣ Ignition Coil or Ignitor Heat Failure​


  • A coil or ignitor that works cold but fails when hot will cut spark until it cools slightly.
  • This is one of the most common “runs perfect → dies hot → restarts” patterns.
  • Test: When it stalls, immediately check for spark at the plugs. No spark = ignition issue.


3️⃣ Vacuum Hose / Air Leak Issues​


  • Vacuum leaks cause erratic idle and can make stalling more likely when load changes (e.g., coming to a stop).
  • If a hose is popping off during splutter, that’s a symptom not a cause — the engine is shaking because it’s misfiring, which pops the hose.
  • Clamping the hose won’t fix the root cause — if the shake is strong enough, another hose or fitting will fail.


4️⃣ Blocked Carburetor Idle Jet or Passage​


  • Dirt in the idle circuit will make it run fine at higher revs but stall at idle — but your description suggests a total cutout, so less likely unless it’s debris floating and intermittently blocking jets.


5️⃣ Faulty Carb Solenoid / Fuel Cutoff Valve​


  • Many carbs have an idle cutoff solenoid that shuts fuel when ignition is off. If the solenoid or its wiring is failing when hot, the car will suddenly lose idle fuel.


What I’d Do in Order​


  1. Check ignition spark immediately after a hot stall
    • If spark is gone → replace coil (cheap on a 2E) or check ignitor.
  2. Inspect that carb heat shield and fuel line routing — make sure the fuel line is not touching or near exhaust.
  3. Clean carb thoroughly, especially idle jet and float bowl vent.
  4. Check and replace all vacuum hoses (brittle hoses leak more when hot).
  5. If still no fix — test with a temporary electric fuel pump to rule out vapour lock.


💡 Important: Don’t clamp the vacuum pipe to “stop it popping off” — the shaking that’s throwing it off is telling you something upstream is failing. Fix the root cause first.



If you want, I can give you a simple driveway test to tell in five minutes whether it’s vapour lock or ignition heat failure without any special tools. That would narrow this down a lot.


Do you want me to walk you through that?
 
If your car has a cam sensor or crankshaft sensor replace them. Cheap fix.
Otherwise no idea never owned a Tazz.
 
A car with a carburetor and a distributor in 2025 should be declared a crime against humanity.

Seriously though, I am sure someone can fix it but take it as a sign, find a way for it not to stall just long enough to sell it to an unsuspecting person for R69k, then take that and buy a modern, predictable car.
 
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